REDI-EDGE Pocket Knife Sharpener REPS201 Green The Redi-Edge Pocket Knife Sharpener's card-sized design ensures that it is conveniently portable. Constructed of military-grade aluminum to provide lightweight, long-lasting durability. It features Duromite sharpening elements set at a 40 degree inclusive angle to give your knives a consistent 20 degree double edge. The thumb insert ensures that the sharpener is easy to grip and keep steady, while the lanyard hole allows you to place it on a key